Construction project - ventilation system, heating - your experiences?

Building owners quickly fall in love with one technology or another. I definitely belong to this group as well. This often leads to decisions that are not cost-optimized. In hindsight, almost everyone who hasn’t made a complete disaster will recommend and defend their system. Take a step back and list what is important to you in a heating system. (Space requirements, type of heat, dust generation, allergy requirements, procurement of the energy source, control, noise generation, installation cost, operating costs, maintenance needs, environmental compatibility, appearance, prestige, whatever). Discuss this list with specialists and also with your architect. The architect doesn’t have to be an expert in the chosen technology; what matters is the choice of the executing company and the exchange between this company and the architect. I can also tell you how great I think my heating system is (and it really is), but that won’t get you any further. Ask your architect how he arrives at the €18,000 for the heat pump. You can only compare prices once you know what is included. It could be that, for example, from his point of view, he adds a larger space requirement in square meters for the heating technology, which wouldn’t be wrong if you calculate TCO. 3 sqm more and you already have a difference of easily €6,000.

Ask your architect how he comes to the 18000 for the heat pump. You can only compare prices when you know what has been included. It may be that, for example, he allocates a larger space requirement in sqm for the heating technology from his point of view, which would not be wrong if you calculate TCO. 3 sqm more and you easily have a 6000 € difference.

You are absolutely right. Every builder defends - unless he is totally disappointed - often his way and configuration. It's human nature.

Yes, you have to be able to trust the architect. After all, it can be the case with any architect that his buddy sells the heat pump XY and he then happily also sells the heat pump XY and defends it in his projects in the first place.

The "Heizis" know a lot about gas because it has been a well-known technology for decades.

On the one hand, there is of course the factor of what the installer went through during his apprenticeship or at master school and what came after that and has not yet become second nature to him. And on the other hand, not to be forgotten: sometimes there are long-standing relationships with manufacturer A, who with technology X was always the best (or at least consistently among the top three for many years), and then technology Y comes along (where manufacturer A is not among the top three) and you are faced with the problems of 1. building a relationship with a "new" manufacturer (purchase conditions, training for certifications, personal relationships with clerks) and 2. worsening your conditions with manufacturer A if you purchase units elsewhere. It is quicker to adopt the attitude that the newfangled stuff has not yet proven itself.

After all, it can be the case with every architect that his buddy sells heat pump XY

The culture of live and let live, i.e. that both clients and craftsmen are happy and satisfied, I consider to be not the least important part of being an architect – something my "clients" – I am professionally in an "architect position" (although not for house construction) – also highly appreciate. No investment goods "consumer" really enjoys it when a provider "goes under" in trying to give them the "best" price. You also want to be able to look each other in the eye during customer service. However, it must not be interpreted as giving a provider "protection like a dinosaur," if they have not understood the situation and have missed the train.

Heat pump without buffer storage.

You mean that the heat pump itself should not have a buffer storage. Instead, it should be purchased separately depending on hot water demand?

Which buffer storage do you have with your Geisha? Are there even any bad manufacturers?

**Edit: Am I seeing this correctly or did I overlook something: the already extremely affordable Geisha can even be subsidized with 1,300 EUR by BAFA when building a new single-family house?

No, the heat pump should go directly to the underfloor heating for heating, without a storage tank before or after. The screed is the storage.

You need a hot water storage tank in any case. The Geisha does not have one integrated and you can put a suitable one in. It should have a minimum of 2m2 heat exchanger surface, better more. Our heating technician recommended ours and I did not want to provide my own material: Juratherm hdw 200. Many use storage tanks from SHWT, cheaper and somewhat worse values.

Before you commit to the Panasonic, see if a trench collector is possible. The subsidy is certain there, but more own effort is required. With an air-water heat pump, the subsidy is very difficult because you have to prove an annual performance factor of 4.5 on paper. I have not looked into it further because the heat pump was not listed with Bafa at the time. If it is cold in your region, it probably won't work.

There is a website for the Geisha, Club something, there is basically everything there. Otherwise, create your own heating thread..

I have just started a new thread in the heating subforum regarding underfloor heating and air-water heat pumps in general.

I had already found the club page aquarea smallsolutions, thanks.

I find ring trench collectors problematic because they extract necessary heat from plants/trees (or more specifically their roots) above them. I would need to know now where I definitely do not want to plant anything. Or is it just fake news that the vegetation above/near the ring trench collector suffers from it?